The road guard rail is one kind of assembly very nimble product, widely uses in the road, the railroad, the highway and so on; Both may manufacture the permanent net wall, and may take the temporary isolation network use, only need select the different column fixed method then to be possible to realize. The product color is bright, anti-aging, anti-corrosive, the specification is complete, the net surface is smooth, the force tightens, not easily external force hit distortion. The scene work, the product most major characteristic is flexible, may momentarily adjust the modelling and the size according to the scene request. The structure succinct, artistic practical, is advantageous for the transportation, the field of vision is open, the barrier property is good. The installment the hypsography limit, regarding the mountainous region, the land on slopes, the curved region compatibility is not been extra-heavy, has the merit which other structure isolation grid is unable to compare.